Lay motion for looms



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LAY MOTION FOR Looms March 1o, 1953 i5 sheets-sheet 1 Filed July 5, 1949 www charme March 10, 1953 w. c. slm-WELL 2,630,839

A LAY MOTION FOR Lows. A

Filed-July 5, 1949 15 sheets-sheet 4 I 1,; C94 a;

gmc/Mw Wlliwm C'gBrtu/QLI/ @Mm/@www ATTO R N EY-S March 10, 1953 w. c. slm-WELL 2,630,839

LAY MOTION Foa Looms Filed July 5, 1949- 15 Sheets-Sheet 5 Tf f 1/@5 V 1NvENToR. Willi/am GBirweLL Aww/249514,.

March y10, 1953 w. c. Bm'rwELL LAYMoTIoN Fon LooMs i5 Sheets-Sheet 6 Filed July 5, 1949 ATTORNEY March 10. 1953 Flled July 5, 1949 March l0, 1953 W. c. BIRTWELL 2,630,839

i LAY MOTION FOR LOOMS Filed July 5, 1949 15 sheets-sheet' a HWENTOR.:-

v Willian? CIrwel/l @y @f1/w? IMM I /lztarrreys March 10, 1953 w. c.. Bim-WELL 2,630,839

LAY MOTION FOR Loomsv www airtweu A homey:

March 10, 1953 w. c. slm-WELL 2,630,839`

LAY MOTION FOR LOQMS Filed July 5, 1949 A v 15 sheets-sheet 1o I N VEN TOR.

l /Vlliwm/ Cirwell BY MMO, @m I March 10, 1953 w. c. BIRTwELL 2,630,839

LAY MOTION FOR LooMs Filed July 5, 1949 l5 Sheets-Sheet 1l A tt afneys March 10, 1953 ,w. c. BIRTWELL LAY MOTION FOR LooMs iled July 5, 1949 15 Sheets-Sheet l2 lrillluxlllm Irl! William Cirwell .daar-naw.

March 10, 1953 w. c. BIRTWLL 2,630,839

LAY MOTION FOR LooMs Filed Julyl 5. 1949 15 sheets-sheet 1s INVENTOR.

` Wlliwmarwell eff MMZQQLM Attorneys March I0, 1953 w. c. Bim-WELL 2,630,839

LAY MOTION FOR LOOMS Filed July 5. 1949 15 Sheets-Sheet 14 IIIIH lll! IIIIIIH HH h I v a i li \IIIIIHHI l I l l I I JNVENTOA "wzliamoiftweu BY j 4M @d4/ 'MM Attaxvreys March lo, C. B|RTVVELL LAY MOTION FOR LOOMS Filed July 5, 1949 15 sheets-sheet 15 w Wizziqmczrtm MMWMIMW v v ATTQR N EVS Patented Mar. 10, 1953 UNITED STATES PATENT OFFICE `2,630,839 LAY MofroN FQR LooMs William C. BirtwelL'North Scituate, R. I., assigner 'to Dunn `Worstcd Mills, Woonsocket, R. I., a corporation of Rhode Island Application July 5, 1949, Serial No. 103,125

25 c1aims. l

The present invention relates to a shuttlelje'ss loom and, more particularly, to a new and improved electrical system for actuating the devices for carrying the weft threads through the shed.

A primary object of the invention is t Drovide, in a loom, new and improved electrica-l devices, circuits, and circuit controllers for 'actuating a plurality of thread carrying travellers, to the end that the weft threads are carried through the shed in position to be beaten into the fell of the cloth. Instrumentalities of various types may be used in combination with the electrical devices, to control the return move'- ments of the travellers, to effect the presentation of the weft threads to the travellerato secure the same therein, to inject the travellers into position to be acted upon by the electrical.r

devices and to cut the thread and release the saine from the travellers at the conclusion of their movement through the shed.

The invention of the present application is concerned primarily with the electrical devices and the electrical system, as many different types of mechanical devices may be employed in combination therewith.

An object of the invention is to provide a loom in which the use of thread holding, storing,

and carrying shuttles are eliminated, and in which the weft threads are always drawn'from a source of supply, in the same direction through the shed.

Another object of the invention is to provide a loom in which the weft threads are carried through the shed by one or more travellers hav-v ing means associated therewith for 'grasping and then releasing the thread.

Another object is to provide means for creating a linearly travelling electromagnetic field along the lay of a loom from one vend thereof tow-ard the other end, and to provide, in combination therewith, a thread carrying traveller in which currents are induced by the ilux of said iield to cause the traveller to traverse the lay.

`Another object is to provide a thread carrying traveller of non-magnetic material in which the currents are induced and in which the induced currents, reacting upon the flux in the iiield cause the traveller to traverse the lay.

Another object of theinventionis to provide an elongated magnetic core having a plurality of induction coils wound thereon, providing a linear polyphase winding and producing a linearly travelling electromagnetic 'eld along the core and along the lay in a direction vfrom one end thereof to thecther,4 in combination with circuit controlling devices for energizing the core throughout only a relatively short section thereof at one time, and for shifting the Venergized sections progressively from end to end of the core.

Another object of the invention is to reduce `very materially the currents required to energize the coils associated with the core, -iirst, by delivering the current thereto, section by section and, second, by using capacitances in the energizing circuits.

Another object of the Vinvention is to facilitate switching of the current from section to `section or group to group of `coils andto eliminatesparking, by including in the circuit, capacitances through which the coils may discharge, before being disconnected from the current source.

Another ob-ject ofthe invention is to reduce `the number of capacitances which would othertween the emergence of any one traveller from the electromagnetic field and the re-introduction thereof, with a new thread, into the field, to the end that the travellers will not become overheated as a result of the induction of currents therein, as would be the case if only one o r a few travellers or shuttles were repeatedly subjected to the influence of the eld in closely spaced time sequence.

Another object is to provide an improved traveller construction having self-guiding means associated therewith, tending to center the same in predetermined relation, relative to the electromagnetic iield, to the end that the traveller, during its traverse of the lay will not be projected laterally from the field by the electromagnetic forces but will follow the line of the core from end to end.

.1i-further object of the invention is to so control the duty cycle for each individual section of the electromagnetic core that the `geometry of said core be reduced to a practical minimum.

lin other words, the invention aims to` reduce thesize of the coils and core andthe gauge of the Wire in the windings, while preventing overheating of the coils and core, by energizing any one` `section of the core for only a `fraction of the time that the machine is in operation.` For instance, if there are three sections in the core, each section is energized only one-third of the time, with the result that the geometry of the coils and core need be only one-third of that which would be required if the section were energized continuously.

Another object of the invention is to employ capacitors in the circuit to correct power factor in the electromagnetic induction system.

Although the invention is not confined to the use of high frequency polyphase alternating current, an object of the invention is to provide a system in which current of this type may be employed, in order that vastly smaller and less expensive capacitors may be used.

The loom of the present invention necessarily includes certain standard elements which may be of conventional form or of special design, so long as they perform their intended functions. For

instance, warp threads are led through harnesses to the fell of the cloth, adjacent the lay, and a reed is provided to beat the weft into the fell, as the harnesses are operated and as the warp threads are separated to provide a shed through which the next weft thread is carried. The essential features 0f the present loom, in addition to the foregoing are a plurality of travellers, an injection and feed system for the travellers,

-the electromagnetic means for causing the travellers to traverse the lay, means for receiving the travellers at the discharge end of the lay, means for releasing the threads from the travellers at the conclusion of this movement, means for returning the travellers to the injection and feed system, means for presenting a thread to each traveller prior to its passage through the lay and means for cutting the thread after the passage of each traveller through the lay.

As stated above, these means may take many different forms, and the ones shown herein are for purposes of illustration only, as the present invention relates to the general combination of such means and to the electrical devices, circuits and systems for causing and controlling the movement of the travellers through the shed and along the lay.

Fundamentally, in the operation of the apparatus in accordance with the invention, each traveller is conveyed through the feed system to the injection device, be it electrical or mechanical, into a position where a thread presenting device or color selector presents a thread to the traveller. The injector then moves the traveller into the shed of the loom and into the linearly travelling electromagnetic field produced by the linear polyphase winding on the electromagnetic core, with the result that the currents induced in the traveller cause the same to move rapidly in the direction of movement of the field. The coils along the core are energized successively, section by section, as the traveller moves therealong so that, in effect, the traveller is continuously subjected to a linearly travelling polyphase eld from end to end of the shed or the like. The traveller emerges from the shed and enters a receiving device, which may be of one type or another, where the thread which has been carried through the shed by the traveller is released. The traveller is then returned to the reserve supply of travellers and the thread at the infeed end of the shed is cut, while the reed beats the thread into the fell of the cloth and the harnesses shift the warp threads in the usual manner. W hen this action has been completed, another traveller is delivered to the injector and a thread is presented thereto, as previously described, and the cycle is repeated.

In the accompanying drawings, a number of specific embodiments of the invention are shown, but it must be understood that the invention is not limited thereto and, more particularly, is not to be restricted to the particular mechanical devices for handling the travellers after their movement through the shed, for delivering the travellers to the head end of the lay, for injecting the travellers into the field and for cutting the thread and releasing the same from the travellers, as many alernative mechanical devices for performing similar functions will readily occur to one skilled in the art.

In the drawings:

Figure 1 is a block diagram, in plan, showing the relative position and arrangement of the fundamental elements of the invention;

Figure 2 is a plan View, with certain parts removed, taken on a plane just above the cloth and showing one means for returning the travellers and for presenting them to the injection device;

Figure 2a is a transverse section on line 2a-2a of Figure 2;

Figure 2b is a section on line 21o-2b of Figure 2;

Figure 3 is a view similar to Figure 2, showing a modification;

Figure 3a is a section on line 3a-3a of Figure 3;

Figure 4 is a section and elevation, with certain parts omitted, taken at the foot 01 discharge end of the lay.

Figure 5 is a plan view, with certain parts omitted, showing one form of thread presenting device and certain parts of the traveller injecting mechanism;

Figure 6 is a somewhat diagrammatic view, in section and elevation, showing certain of the parts of Figure 5, taken substantially on line 6-6 of Figure 5;

Figure 7 is an elevation of the injector return arm, looking from the left of Figure 6;

Figure 8 is a fragmentary transverse section and elevation, taken substantially on line 8-8 of Figure 5;

Figure 9 is a similar view, taken substantially on line 9-9 of Figure 5;

Figure 10 is a detail elevation of the thread gripping fingers associated with the thread presenting device;

Figure 11 is a plan view with certain parts broken away, showing one form of mechanism for receiving the travellers after their passage through the shed;

Figure 12 is a vertical section of the mechanism of Figure 11, taken substantially along line l2-I2 of Figure 3;

Figure 13 is a detail horizontal section on line |3-l3 of Figure 12;

Figure 14 is a fragmentary section and elevation on line l4-I4 of Figure 11;

Figure 15 is a similar section and elevation taken on line I5-I5 of Figure 11;

Figure 16 is a similar section taken substantially on line lE-IB of Figure 11;

Figure 17 is a section and elevation taken on line II--I'I of Figure 11;

Figure 18 is a fragmentary section taken on line lll-I8 of Figure 17;

Figure 19 is a fragmentary section on line IB--IS of Figure 18;

Figure 2O is an end elevation and partial sectially on line F-20 of Figure `5 andishowing one type of thread cutting device;

Figure 21 is a fragmentary elevation showing a thread cutting shear mechanism, as a modication;

Figure 22 is a fragmentary plan view of the mechanism shown in Figure 2l;

Figure 23 is a plan viewy of a preferred form of thread carrying traveller;

Figure 24 is an endk view, taken from the. left of Figure 23;

Figure 25 is a side elevation of the traveller shown in Figure 23;

Figure 26 is an enlarged elevation of the thread clamping mechanism in thev open position;

Figure 27 is a transverse view, on a greatly enlarged scale on line 21.-21 of Figure 23;

Figure 28 is aside elevation, with an end section broken away, showing the top and bottom cores, the coils wound on the latter, and, diagrammatically, the electrical connections for certain of the coils;

Figure 29 is a plan view on an enlarged scale of an end section of the bottom core, showing the winding of the coils thereon;

Figure 30 is an end elevation of the cores shown in Figure. 28;

Figure 31 is a side elevation of a program switch;

Figure 32 is a diagrammatic viewvshowing the arrangement of contacts on certain of the stationary contact rings of the program switch; and

Figure 33 is a circuit diagram.

Referring to Figure 1, the breast beam of a loom is shown at I0. The warp threads II are drawn from a source of supply, such as a warp beam, over a guide beam l2, forwardly through the harness I3 and the reed I4, to the shed I5. The fell of the cloth is indicated at I1 and the cloth I8 is drawn downwardly from the breast beam II) and wound up in conventional manner.

The elongated electromagnetic core 2U extends along the lay, from the head end 2| to the foot end 22. The thread carrying travellers are projected along the lay by the travelling electromagnetic field, as hereinafter explained. At the foot end, the travellers are received in a mechanism 23, which releases the thread from each traveller and starts the traveller on its return path. As pointed out below, this mechanism may be in the form of a curved chute or an intermittently actuated dial, having pockets for receiving the travellers. The travellers are delivered to a return conveyor 25, preferably positioned below the breast beam, by which they are returned to the head end of the loom. At the latter end, they are handled by a mechanism 26, which delivers them to an injector 28. At this point, a thread is presented to each traveller by the color selector or thread presenting mechanism 29,. The injectormechanism projects the traveller into theshed of the cloth, above the core, and the travelling electromagnetic field carries the traveller along the lay,

`drawing the thread behind, through the shed.

The reed I4 beats-the thread into the. fell While the harnesses I3 operate in the usual manner.

`The trailing end of the thread, adjacentthe color selector or thread presenter 29 is severed with another traveller entering the injector 1 Crompton & Knowles loom. The main drive shaft for theloom, indicated at 36 carries a large spur gearxV 3|', in mesh with a smaller gear 32 on a shaft 33 having cranks on its opposite ends, one of` whichi isf shown at 34. The cranks are connected by pitm'ans 35 to the lay swords 36 carrying the reed mechanism I4. The reed includes a plurality of fine wires or reeds 31, between which the warp threads Il extend, as is well understoodin the art, so that the reed beats the weft threads into the fell Il of the cloth. Projecting upwardly from the pivots 38 for the lay swords area pair of elongated arms, one of which is shown at 40 in Figure 4. The upper ends of the. arms project rearwardly as at 42 and are interconnected by a bar 43, from which an upper core member 44 is suspended by hangers 45. An upwardly facing channel member 46, also carried by the arms, serves as a support for the lower core member 4l,v the upper surfaces of which carry a Micarta strip'48, or a strip of similar synthetic resin, Alaminated' insulating material.

The core supporting arms have secured to their side-faces rearwardly projecting plates 50, each provided with a cam slot 5I, in which a roller, secured toa stub shaft 52 is disposed. The stub shaft is disposed within aligned openings in the ends of links 53 and 53, respectively. The former is a bent link, having its other end connected to a, sleeve 55, loose on the main driving shaft 30, and the latter has its other end pivoted to a pin 56 carried by a block 51 mounted upon the lay sword 36.

As aresult of this arrangement, the crank 34 swings the 'lay sword back and forth, with a simple harmonic movement, in timed relation to the other movements of the loom, as is well understood in the art. The connection between the lay sword and the core supporting arms, just described, issuch that the reed quite closely appreaches the cores, before they move forwardly toward the breast beam lil. During the final portion of the travel of the reed, however, the core supporting arms move forwardly with accelerated movement so that, when the Yreed beats the `thread into the fell of the cloth, the cores are movedout of the way, to the dotted line position in Figure 4. This delayed movement of the core supporting means and of the cores is desirable, so that the` cores remain in operative position behind the fell of the cloth as long as possible, to permit the traveller to complete its motion, before the cores are swung forwardly. On the return movement cf the reed and of the lay sword, the movement of the cores is similar. That is, they move rearwardly quite rapidly at the outset, so. that they return to their operative position and come to rest relative to the lay and to the fell of theA cloth; before the reed has returned to its most rearwardly disposed position.

Upon the. end .of the counter shaft 33, there is a sprocket 60, transmitting continuous movement to. a chain 6i, trained about another sprocket 62 constituting a conveyor drive, as hereinafter explained, and about a third sprocket 63, constituting the drive for the program switch y64.

As shown in Figures 2 and 2a, the upper core 44 and the lower core 4l are disposed in angular relation, corresponding to the angles of the warp threads, whenl separatem byy thefharness. The

upper core preferably consists simply of a plurality of laminations of silicon steel, arranged side by side, extending lengthwise and carried by a channel 65. The lower core 41 similarly consists of a plurality of laminations of silicon steel strips appropriately secured within the supporting channel 46, for instance 'by wedge strips 61, of the same kind of insulating material as the strip t8. As hereinafter explained, the lower core is preferably made up in a plurality of sections, has a number of slots cut therein, and is provided with a polyphase winding, certain coils of which are shown at 68 and 69 in Figure 2a.

At the foot end 22 of the lay, in the form of the invention shown in Figures 2, 2a, and 2b, the receiving device 23 for the travellers, projected through the shed by the travelling electromagnetic eld, takes the form of a curved, U-shaped, return chute 10 having a flaring mouth 1| and a downwardly inclined exit end 12, extending through an opening 13 in the upper surface of the breast beam I0. Below the breast beam is a belt conveyor 15, journalled on rollers 15, 11 at 0pposite ends thereof. As the travellers are projected into the chute 10, their momentum carries them around to the opening in the breast beam, where theyl are deposited upon the conveyor 15 for return to the head end of the system.

When each traveller enters the return chute 10, the thread holding catch associated therewith is released, by engagement with the roof of the chute or by engagement with a special cam, not shown, so that the catch is opened and the thread is released.

At the head end of the system, there is a conveyor chain 18, trained about a plurality of idler sprockets 19, 80, 8|, and 82 and about a driving sprocket 83. The chain, throughout its active run, travels in a slot 81S formed between plates 85 and 86 constituting a slideway for the traveller infeed system 26. In this slideway there is a spring stop nger 81, which arrests the movement of the line of travellers, as they are pushed forwardly in a continuous line by the conveyor belt 15, and until they are picked 01T one by one, by pusher pins 88 carried by blocks 89 associated with the chain 18. In other words, a line of travellers are moved forwardly by the belt, until they are arrested by the spring stop 81. The conveyor belt slides under their bottom surfaces and brings successive travellers into the line until their movement is arrested by contact with the trevellers ahead. Each pin associated with the chain 18 moves laterally between the brow of one traveller and the rear of the one ahead, engages the rear end of the leading traveller and pushes the same past the spring stop. The pin carries the traveller around the slideway until it moves away from the traveller, by passage around the idler sprocket 8|, leaving the traveller in the proper position in the injection system, as indicated at 90 in Figure 2.

When in this position the traveller takes a thread from the thread presenting mechanism, and the injector mechanism is operated to project the traveller into the shed, into position to be operated upon by the linearly travelling electromagnetic field.

Before describing these mechanisms and their mode of operation, the preferred construction of the travellers per se will be considered, referring to Figures 23-27.

Each traveller 9| comprises a pair of sheet metal base plates 92 and 93, arranged in over- `lapping relations along their adjacent edges,

substantially on the center line of the traveller, with a layer of insulating material 94 interposed therebetween. Along the line of the overlap, substantially centrally of the traveller, there are a plurality of sheet metal strips 95 and 96, with interposed layers of insulation 91. Adjacent the right hand portion, and above the base 93 are a plurality of additional sheet metal strips 98 and 99, preferably shaped substantially as shown, with layers of insulating material |00 interposed therebetween.

The base plates and the various strips are preferably made of sheet aluminum, while the insulation may be cloth impregnated with a suitable dielectric synthetic resin, adhesive material. The traveller is generally boat-shaped in plan and the forward end of the plate 92 is turned upwardly and rearwardly as indicated at |0|, to provide a blunt prow to facilitate the travel of the device through the shed. The left hand marginal edge of the plate 92 is turned upwardly, as indicated at |02 and, at its forward end is curved inwardly and rearwardly, as at |93, where it joins the upturned portion |0|, to complete the prow.

Secured to the rear portion of the plate 92 is a thread receiving and holding clamp assembly indicated generally at |05. The latter preferably comprises a xed jaw member consisting of a base flange |06 (Figure 26) and an upstanding strip |01 having a plurality of teeth |08 along its upper edge. A movable jaw member |09 having an upwardly and rearwardly projecting tail piece ||0 is pivoted to the strip |01 at and is urged downwardly by a leaf spring ||2, bearing against a pin ||3 at its forward end and secured to the rear end of the fixed jaw by a screw H4.

The upstanding side flange |02 is preferably provided with a plurality of holes ||5, for purposes hereinafter explained.

If desired, the rear edge of the plate 92 may carry an upstanding bracket ||6, which serves as a surface against which the nose of a following traveller may abut.

The thread presenting device, best shown in Figures 2, 5, 8, and 9 is actuated by the drive shaft ||8, upon which the driving sprocket 33 for the chain 'i3 is mounted. Hence, the movements of the thread presenter are coordinated with the movements of the pins on the chain, which advance the travellers to the position to receive the thread and to be projected into the shed.

A bracket |29 secured to the breast beam I0 carries a pivot pin |2| for the thread presenting arm |22 and a pivot pin |23 for a cam following arm 24. A link |25 connects the two arms. A cam following roller carried by arm |20 is in engagement with the surface of a cam |21, fast on the shaft ||8.

The thread presenting arm |22 has a downwardly turned rear end |28, upon the lower end of which is secured a'pair of leaf spring fingers |29, having flaring forward ends, as indicated in Figure 10. The arm also carries a rearwardly projecting thread guiding eye |30 and a downwardly projecting thread guiding post |3|, having an eye adjacent its lower end.

Projecting forwardly from a xed post |32 is an arm |33 having on its forward end a vertically adjustable pin |34,- secured in adjusted position by a pair of nuts |35. As shown in Figure 9, the

`pin |34 carries a rearwardly extending foot |36,

directly above the upwardiy'and `rearrarely extending tail piece of the -pivoted jaw of 'the' position, with the weft thread |40, leading from a suitable source of supply, guided through the eyes |30 and |31 and with its free end gripped between the spring fingers |29. As the traveller is moved forwardly to said position, the jaws of the thread clamp are opened, as explained above, and the weft thread is carried into a position between the upper and lower jaws. The injector mechanism, described below, projects the traveller forwardly into the shed. The movable jaw snaps shut, rmly grips the thread-jerks the free endV thereof out of the spring fingers |29, and carries the thread through the shed. While this is occurring, the cam |21, rotating inthe direction of the arrow in Figure 5, swings the cam following arm |24 and the thread presenting arm |22 toward the right. After the traveller has completed its traverse of the lay and just before the reed has completed its action of beating the thread into the fell, the arm |22 reaches the p0- sition shown in dotted lines in Figure 5, and the spring fingers are again brought into gripping relation to the thread. Immediately thereafter, the thread is cut adjacent a xed guide post at |42. As the cam continues to rotate, the arm |22, with the cut thread gripped in the iingers |29 returns to the original position and presents the thread tothe opened jaws of the next traveller. Meanwhile, the reed completes its operation, the harnesses shift the warp threads and the machine is ready for another cycle of operation.

It should be noted that the delivery end 85a oi the slideway is tipped downwardly and rearwardly to correspond to the angle of inclination of the upper surface of the lower core member. The injector assembly comprises-a pair of supporting members Ed, |50 having their upper surfaces similarly inclined, which receive the travellers from the slideway section 86a, under the impulse o1 the pusher pins 88.

As shown in Figures 5 and 6, the supporting member |55 iscut'away as at '|i`|.,'providing aslot through which the upper end .|48 of an injecting arm Edt may extend. The latter may constitute a laterally turned portion of -a longitudinally extending rod |59, guidedv in appropriate lugs |5|, carried by horizontal plate |5ia, and normally urged forwardly by va compression spring |52 connected to and bearing against a collai` |53 fast on the rod. This spring is connected to the collar and to the rear guide lug 5| under torsional tension, so as to tend to rotate the rod in a direction to urge the arm 4lil-l downwardly into rin engagement with a stationary keeper plate having a notch |55 its upper surface. Y

Rei'erring to Figure 5, the lower end of the shaft i i5 carries a bevei gear |571., in mesh with a simiiar gear on a shaft |55 having a laterally projecting arm itetheieon as well asa ysprocket |6|. A chain |52', trained about sprocket |6| and about a sprocket |55 on the maindrive shaft 3|), drives the shaft H5 and all of the parts connected thereto.

A bracket |55, provided with a laterally turned end 55, carries a pin 57|, which serves as a pivot for a block |53, having a socket for the lower, laterally turned end |69 of an upwardly eX- tending, swinging arm |10. To the upper end ol this arm is secured laterally projecting finger directly below the rod |50, in position toengage the collar |53. A tension spring |12 constantly urges the swinging arm |10 forwardly or to the right as viewed in Figure 2. The swinging movements of the arm |10 are guided by a strip |13, secured by appropriate bolts in spaced relation to the plate |5 la, which constitutes the support for the lugs |5|, in which the rod |50 is guided, and for the keeper plate |55.

The swinging arm |10 carries a cam plate |15, disposed in the path of movement of the laterally projecting, revolving arm |60. Hence, during each revolution of the arm |60, the arm |10 is swung rearwardly or toward the left, in Figure 2. The inger |1| at the upper end of the arm |10 engages the collar |53 and moves the rod |50 rearwardly or to the left in Figures 2 and 6. At the end of this movement, the laterally turned end |59 of the rod snaps dolvnwardly into the notch |56 of keeper plate and the injector is retained in this retracted position, while the swinging arm 10 moves forwardly to its original position, under the influence of the spring |12.

A trigger rod |11 has one of its ends |18 hooked around the upwardly extending end of the laterally turned portion |49 of the injector, and its other end connected at |19 to a lever |80, pivoted to the loom at |8| and disposed in engagement with a cam |32 carried by the main drive shaft 30. When the projection on the cam |82 swings the lever |50 toward the left (Figure 6), the trigger har |15 lifts the laterally turned portion |49 out of the notch |55` in the keeper plate and projects the end of the injector upwardly behind the associated traveller. As soon as the injector is thus released, the compression spring |52 projects the same forwardly, to inject the traveller into the shed, in position to be acted upon by the linearly travelling electromagnetic held. The revolving arm 6c then re-engages the cam |15, so that the iinger |1| again engages the collar |50 and returns the parts to their original, cocked position.

Ilhe modification shown in Figures V3, 3a, and 11-19 differs from the foregoing primarily as regards the mechanisms for receiving the travel- 1ers, for returning them to the head end of the lay and for delivering them to the injector mechanism. Otherwise, the parts may be substantially identical.

Instead of using a return chute 10, this form of the invention includes an intermittently rotating dial |85 disposed above a platform .|83 at the foot end of the lay, having a plurality of pockets |86 therein, which are positioned to receivethe travellers .as they are projected out of the eld. Also, the conveyor belt 15 has been eliminated and an extension of the sprocket chain substituted therefor.

Beneath the breast beam I0 are a pair of angle irons |81, |88 along which the travellers move, under the inuence of pins |89, carried by blocks |90 associated with an elongated chain |9|, trained about the sprockets previously mentioned and receiving movement from the driving sprocket 83 Von shaft ||8. From the idler sprocket 82, the chain extends toward the right, below the breast beam, behind the angle iron |88 in a return or inactive run |92. At the foot end of the lay, the chain is trained about a sprocket |93 on the upper end of a stub shaft |94 (Figure l2) journalled in a bracket |95 carried by a channel member |96 secured to the breast beam |0. Additional tensioning and idler rolls may be provided if desired, as indicated in Figure 3. From these sprockets, the 

